Understanding Efficiency Metrics
- Enter your US MPG in the left input to get the Metric equivalent.
- Enter L/100km in the right input to calculate the US MPG.
- Observe the Visual Gauge to see your vehicle's efficiency rating (Excellent, Moderate, or High).
- Review the Comparison Info for tips on British vs. US measurements.
Frequently Asked Questions
How do I convert MPG to L/100km?
To convert US MPG to Liters per 100km, divide 235.215 by the MPG value. For example, 30 MPG becomes 7.84 L/100km.
Is a higher L/100km better?
No. Unlike MPG where higher is better, for L/100km, a lower number is better because it represents using fewer liters of fuel to travel the same 100km distance.
What is an excellent fuel economy?
Generally, for standard passenger vehicles, anything below 6.0 L/100km (39+ MPG) is considered excellent. Heavy SUVs often range from 12-15 L/100km (15-20 MPG).
Are British MPG and US MPG the same?
No. An Imperial (UK) Gallon is 4.54 liters, while a US Gallon is 3.78 liters. This means a car rated at 30 MPG (UK) would only be about 25 MPG (US).
Efficiency Highlights
- Instant bi-directional conversion
- Visual efficiency rating gauge
- Supports both US and Metric formats
- Accurate to 2 decimal places
- 100% private — your car stats stay local
- Mobile-optimized for clear comparison